Capacitance Reduction With An Optimized Converter Connection Applied to LED Drivers
- 2 June 2014
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industrial Electronics
- Vol. 62 (1), 184-192
- https://doi.org/10.1109/tie.2014.2327591
Abstract
This paper presents a new control method and a detailed project methodology for the optimized connection method of two converters, aiming to reduce the redundant power processing, in order to supply high-power light-emitting diodes (LEDs) with reduced capacitance and high efficiency, directly from the ac line. This connection method allows dealing with two major issues related to the LED driver: capacitance reduction and efficiency increasing. The first converter provides power factor correction, whereas the second converter controls the current through the LED. The basic idea consists in making the second converter to process only the low-frequency ripple (LFR) of the first converter, thus smoothing the LED current. In this way, the LFR is managed by the second stage, so that the capacitance of the first stage can be significantly reduced. The proposed control method can achieve better results for the low-frequency compensation. In addition to that, a high power factor and a low harmonic content are obtained, fulfilling the IEC 61000-3-2 Class C requirements. A laboratory prototype with a rated power of 75 W and an input voltage of 220 V rms /60 Hz was built in order to show the feasibility of the idea. The measured overall efficiency of the converter was 91%, and electrolytic capacitors were avoided.Keywords
Funding Information
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES/DGU249/11)
This publication has 39 references indexed in Scilit:
- High-Efficiency LED Driver Without Electrolytic Capacitor for Street LightingIEEE Transactions on Industry Applications, 2012
- Integrated SEPIC buck-boost converter as an off-line LED driver without electrolytic capacitorsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2012
- A Flicker-Free Electrolytic Capacitor-Less AC–DC LED DriverIEEE Transactions on Power Electronics, 2011
- Minimizing Required Energy Storage in Off-Line LED Drivers Based on Series-Input Converter ModulesIEEE Transactions on Power Electronics, 2010
- Resonance-Assisted Buck Converter for Offline Driving of Power LED Replacement LampsIEEE Transactions on Power Electronics, 2010
- Design and Performance Considerations of PFC Switching Regulators Based on Noncascading StructuresIEEE Transactions on Industrial Electronics, 2010
- A 0.9 PF LED driver with small LED current ripple based on series-input digitally-controlled converter modulesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2010
- Means of Eliminating Electrolytic Capacitor in AC/DC Power Supplies for LED LightingsIEEE Transactions on Power Electronics, 2009
- A family of PFC voltage regulator configurations with reduced redundant power processingIEEE Transactions on Power Electronics, 2001
- An alternative to supply DC voltages with high power factorIEEE Transactions on Industrial Electronics, 1999